Self -etching Dentin Primers Containing Phenyl-P

Abstract

The dentin bonding efficacies of two commercial dentin bonding systems and experimental self-etching dentin primers composed of methacryloxyethyl hydrogen phenyl phosphate (Phenyl-P) and either hydroxyethyl methacrylate (HEMA) or glyceryl methacrylate (GM, 2,3-dihydroxypropyl methacrylate) were examined. The wall-to-wall polymerization contraction gap width of a commercial light-activated resin composite in a cylindrical dentin cavity and the tensile bond strength to a flat dentin surface were measured. Changes in dentin hardness were determined by Micro Vickers Hardness measurement, and an SEM observation was performed after priming. Formation of a contraction gap was completely prevented by the application of Phenyl-P diluted in HEMA or GM solution combined with a commercial dentin bonding agent, although gap formation was evident in nearly half of the specimens with both commercial dentin bonding systems. The mean tensile bond strengths of the tested groups varied from 16.3 to 20.7 MPa, and there were no significant differences between groups. Based on the measurement of Micro Vickers Hardness and SEM observation after priming, a slight reduction in dentin hardness was observed. However, this reduction in dentin hardness due to self-etching priming did not significantly correlate with either contraction gap width or tensile bond strength.

Retrospective Study of Five-year Clinical Performance of Direct Composite Restorations Using a Self-etching Primer Adhesive System

“…During the 1990s too, self-etching primer adhesive systems were introduced. These systems were characterized by the combination of etching and priming steps into a self-etching primer followed by the placement of an adhesive resin onto the prepared tooth surface 5,6 . Self-etching adhesive systems use weak acidic monomers to condition the enamel/dentin substrate.…”

Effect of polymerization protocol on the degree of conversion of photo- and dual-polymerized self-etch adhesives

“…Despite the long-term clinical success that has been achieved with etch-and-rinse adhesive systems, development of self-etch adhesives has been an appealing solution to simplify the clinical procedures without compromising the retention or adhesion of dental restorations [3][4][5][6][7]. Self-etch adhesive resins mainly rely on the use of acidic monomers that simultaneously demineralize and infiltrate into the tooth substrate, eliminating the need of a separate rinsing step, thereby forming a strong micromechanical bond [8,9].…”

The Challenge of MDP Monomer Containing Adhesive Systems: Comparison of Shear Bond Strengths

“…There are a few functional monomers like, 4-methacryloyloxyethyl trimellitic anhydride (4-META), 2-methacryloyloxyethyl phenyl hydrogen phosphate (Phenyl-P) and 10-methacryolyloxydecyl dihydrogen phosphate (MDP) 19,20 These monomers serve various functions like etching tooth substrates, enhancing monomer penetration and also provide that adhesives chemically react with dental substrates. 21,22 In various studies researchers tried to understand the adhesion mechanisms of self-etch adhesives to dental hard tissues which including acidic monomers like 10-methacryloyloxydecyl dihydrogen phosphate (MDP), 4-methacryloyloxyethyl trimellitic acid (4-MET) or 2-methacryloyloxyethyl phenyl hydrogen phosphate (Phenyl-P). [23][24][25][26][27] However first Yohsida et al 28,29 introduced the electrostatically bonding of these monomers to hydroxyapatite (HAp) and the producing of calcium salts which called "adhesion-decalcification concept" and also it has been shown in several studies that MDP monomer have better properties like lower water solubility, higher dentin bonding durability and more readily and intensively ionic binding capability to HAp than others.…”